/* ================================================================
   research.css  —  styles for the scroll-driven Research page.
   Loads AFTER assets/css/main.css (Phantom theme) and inherits its
   fonts (Source Sans Pro), dark-sky body background, and link
   styling. Everything here is scoped to the research page sections.
   ================================================================ */

/* ── Theme variables (mapped to the Phantom palette) ───────────── */
:root {
  --bg:           #000000;
  --surface:      rgba(0, 0, 0, 0.88);
  --border:       rgba(236, 226, 226, 0.16);
  --text:         #ece2e2;
  --text-dim:     rgba(236, 226, 226, 0.55);
  --accent:       #e77500;                      /* Princeton orange */
  --accent-hot:   #ff9b3d;                      /* lighter orange for hovers */
  --accent-glow:  rgba(231, 117, 0, 0.35);
  --font:         "Source Sans Pro", Helvetica, sans-serif;
  --mono:         "Courier New", monospace;
}

/* ── Header (slimmer than the default Phantom 8em padding) ─────── */
#header {
  position: relative;
  padding: 2em 0 0 2em;
  z-index: 50;
}

#header .logo {
  margin: 0;
}

@media screen and (max-width: 736px) {
  #header {
    padding: 1.25em 0 0 1.25em;
  }
}

/* ── Hero / landing section ────────────────────────────────────── */
#header-section {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  text-align: center;
  padding: 4em max(5vw, 2rem) 6em;
}

.h-eyebrow {
  font-family: var(--mono);
  font-size: 0.65em;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.8em;
}

.h-title {
  font-size: clamp(2em, 6vw, 4em);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin: 0 auto 0.7em;
  max-width: 820px;
}

.h-title em {
  font-style: normal;
  color: var(--accent);
}

/* main.css hides h1 <br> below 980px — keep the title's line break */
.h-title br {
  display: inline;
}

.h-wordcloud {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.1rem;
  width: min(100%, 820px);
  margin: 3em auto 0;
}

.h-wordcloud img {
  width: 100%;
  height: auto;
  /* blend the image's black background into the page so the
     rectangle is invisible over the starry body background */
  mix-blend-mode: screen;
  opacity: 0.92;
  transition: opacity 0.2s;
}

.h-wordcloud img:hover { opacity: 1; }

.h-wordcloud figcaption {
  font-size: 0.75em;
  letter-spacing: 0.02em;
  color: rgba(236, 226, 226, 0.72);
  text-align: center;
  line-height: 1.7;
  max-width: 620px;
}

.h-body {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.h-body p {
  font-size: 0.85em;
  line-height: 1.75;
  color: var(--text-dim);
  font-weight: 300;
  margin: 0 0 1.3em 0;
}

.h-body p strong {
  color: var(--text);
}

@media screen and (max-width: 736px) {
  #header-section {
    padding: 3em 1.5rem 4em;
  }
  .h-wordcloud {
    margin-top: 2em;
  }
}

/* ── Scroll indicator (fixed) ──────────────────────────────────── */
#scroll-indicator {
  position: fixed;
  bottom: 2.2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
  z-index: 200;
  transition: opacity 0.7s ease;
  pointer-events: none;
}

#scroll-indicator.hidden { opacity: 0; }

.si-label {
  font-family: var(--mono);
  font-size: 0.6em;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.si-chevron {
  width: 18px;
  height: 18px;
  border-right: 1.5px solid var(--text-dim);
  border-bottom: 1.5px solid var(--text-dim);
  transform: rotate(45deg);
  animation: bob 2s ease-in-out infinite;
}

@keyframes bob {
  0%, 100% { transform: rotate(45deg) translate(0, 0);     opacity: 0.35; }
  55%       { transform: rotate(45deg) translate(3px, 3px); opacity: 0.9;  }
}

/* ── Animation section ─────────────────────────────────────────── */
#animation-section {
  position: relative;
  /* 100vh slide-up transition + ~580vh frame scrubbing */
  height: 690vh;
}

/* Fixed canvas wrapper — covers full viewport, z-index above header */
#sticky-wrap {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 100;
  transform: translateY(100%);  /* JS slides this to translateY(0) */
  will-change: transform;
}

#gif-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ── Full-page cosmic loading splash ───────────────────────────── */
/* Shown immediately on page load (the GIF can take ~10s to decode),
   then faded out by research.js adding the .done class. Sits above
   everything — header (z 50) and sticky-wrap (z 100). */
#loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 50% 42%, rgba(231, 117, 0, 0.12), transparent 55%),
    #000000;
  transition: opacity 0.9s ease, visibility 0.9s ease;
}

#loading-overlay.done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* Expanding rings + glowing core — evokes zooming out through the
   cosmic scales the animation itself sweeps across. */
.lo-cosmos {
  position: relative;
  width: 150px;
  height: 150px;
  margin-bottom: 2.8rem;
}

.lo-ring {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 150px;
  height: 150px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  opacity: 0;
  animation: lo-expand 3s ease-out infinite;
}

.lo-ring:nth-child(2) { animation-delay: 1s; }
.lo-ring:nth-child(3) { animation-delay: 2s; }

@keyframes lo-expand {
  0%   { transform: scale(0.12); opacity: 0; }
  12%  { opacity: 0.85; }
  100% { transform: scale(1); opacity: 0; }
}

.lo-core {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-hot);
  box-shadow: 0 0 24px 7px var(--accent-glow);
  animation: lo-pulse 2s ease-in-out infinite;
}

@keyframes lo-pulse {
  0%, 100% { transform: scale(1);   opacity: 1;   }
  50%      { transform: scale(1.5); opacity: 0.65; }
}

.lo-title {
  font-family: var(--font);
  font-size: clamp(1.15em, 3.6vw, 1.6em);
  font-weight: 300;
  line-height: 1.55;
  letter-spacing: 0.01em;
  text-align: center;
  color: var(--text);
  padding: 0 1.5rem;
  margin-bottom: 2rem;
}

.lo-title .accent {
  color: var(--accent);
  font-weight: 600;
}

.lo-track {
  width: 220px;
  max-width: 60vw;
  height: 2px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  overflow: hidden;
}

#lo-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(to right, var(--accent), var(--accent-hot));
  border-radius: 2px;
  box-shadow: 0 0 10px var(--accent-glow);
  transition: width 0.15s linear;
}

.lo-label {
  font-family: var(--mono);
  font-size: 0.6em;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 1.3rem;
}

/* Respect reduced-motion: keep the splash, drop the looping motion. */
@media (prefers-reduced-motion: reduce) {
  .lo-ring  { animation: none; opacity: 0.4; transform: scale(0.7); }
  .lo-core  { animation: none; }
}

/* ── Left-edge scroll progress bar ────────────────────────────── */
#progress-bar {
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: rgba(255, 255, 255, 0.04);
  z-index: 10;
}

#progress-fill {
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--accent), var(--accent-hot));
}

/* ── Video credit (bottom-right of canvas) ─────────────────────── */
#video-credit {
  position: absolute;
  bottom: 2rem;
  right: 2rem;
  font-family: var(--mono);
  font-size: 0.6em;
  letter-spacing: 0.08em;
  color: rgba(236, 226, 226, 0.4);
  pointer-events: none;
  z-index: 10;
}

@media screen and (max-width: 736px) {
  #video-credit {
    bottom: 0.75rem;
    right: 0.75rem;
    font-size: 0.5em;
  }
}

/* ── Info windows ──────────────────────────────────────────────── */
.info-win {
  position: absolute;
  width: 324px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.2rem 1.2rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 20;
  opacity: 0;
  pointer-events: none;
  will-change: transform, opacity;
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.info-win.visible { pointer-events: auto; }

.win-anchor {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow), 0 0 16px var(--accent-glow);
  flex-shrink: 0;
  animation: pulse-dot 2.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 6px var(--accent-glow); }
  50%       { box-shadow: 0 0 14px var(--accent-glow), 0 0 28px rgba(231, 117, 0, 0.15); }
}

.win-top-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.win-scale {
  font-family: var(--mono);
  font-size: 0.55em;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.85;
}

.win-title {
  font-size: 0.85em;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: #ffffff;
  margin-bottom: 0.7rem;
  line-height: 1.25;
}

.win-img {
  display: block;
  width: 100%;
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 0.8rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06); /* cancel theme dotted link underline */
  text-decoration: none;
}

.win-img img {
  width: 100%;
  height: auto;        /* natural aspect ratio — no cropping */
  display: block;
  opacity: 0.9;
  transition: opacity 0.2s;
}

.win-img:hover img { opacity: 1; }

.win-img.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;   /* placeholder still needs a defined height */
}

.win-img.placeholder::after {
  content: attr(data-label);
  font-family: var(--mono);
  font-size: 0.55em;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.win-body {
  font-size: 0.7em;
  line-height: 1.6;
  color: var(--text-dim);
  margin: 0;
}

.win-link {
  display: inline-block;
  margin-top: 0.65rem;
  font-family: var(--mono);
  font-size: 0.62em;
  color: var(--accent);
  letter-spacing: 0.06em;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

.win-link:hover {
  border-color: var(--accent-hot);
}

/* Mobile: panels are pinned by JS (alternating top/bottom, centered).
   Keep them narrow enough to fit and cap image height so a panel
   never fills the whole screen. */
@media screen and (max-width: 736px) {
  .info-win {
    width: min(324px, calc(100vw - 2.5rem));
    padding: 0.85rem 0.95rem 0.95rem;
    /* two pinned panels (top + bottom) must never overlap */
    max-height: 38vh;
    overflow-y: auto;
  }
  .win-img img {
    max-height: 22vh;
    object-fit: contain;
  }
  .win-body {
    font-size: 0.65em;
    line-height: 1.5;
  }
}

/* ── End section ───────────────────────────────────────────────── */
#end-section {
  position: relative;
  z-index: 110;          /* above the fixed canvas */
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8vh max(5vw, 2rem);
  text-align: center;
  background: var(--bg);
}

/* Gradient blends the frozen GIF into the dark end section */
#end-section::before {
  content: '';
  position: absolute;
  top: -40vh;
  left: 0;
  width: 100%;
  height: 40vh;
  background: linear-gradient(to bottom, transparent, var(--bg));
  pointer-events: none;
}

.end-inner { max-width: 520px; }

.end-inner h2 {
  font-size: 1.1em;
  font-weight: 900;
  line-height: 1.5;
  text-transform: uppercase;
  letter-spacing: 0.35em;
  margin: 0 0 1.5em 0;
}

.end-inner p {
  font-size: 0.85em;
  line-height: 1.75;
  color: var(--text-dim);
  margin: 0;
}

.end-divider {
  width: 32px;
  height: 1px;
  background: var(--border);
  margin: 0 auto 2rem;
}

/* ── Collaborators section ─────────────────────────────────────── */
#collab-section {
  position: relative;
  z-index: 110;          /* above the fixed canvas */
  background: var(--bg);
  padding: 4em max(5vw, 2rem) 6em;
}

.collab-inner {
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
}

.collab-title {
  font-size: 1.1em;
  font-weight: 900;
  line-height: 1.5;
  text-transform: uppercase;
  letter-spacing: 0.35em;
  margin: 0 0 1.5em 0;
}

.collab-inner p {
  font-size: 0.85em;
  line-height: 1.75;
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 2em;
}

.collab-globe {
  margin: 0;
}

.collab-globe a {
  display: inline-block;
  border-bottom: none;   /* cancel theme dotted link underline */
}

.collab-globe img {
  width: min(60%, 560px);
  height: auto;
  transition: opacity 0.2s;
}

.collab-globe a:hover img {
  opacity: 0.85;
}

@media screen and (max-width: 736px) {
  .collab-globe img {
    width: 90%;
  }
}